The correct illustration is "to help the reader visualize the information described".
Option (a);
EXPLANATION:
We all know that the Seven wonders of the world are famous and admired by artists, writers, and scholars all over the world, since time immemorial. In ancient wonders, the illustrations by 'The Seven Wonders of the world' help the reader envision or imagine the information that is described in it.
Reader gets mesmerized by the illustrations, think how beautiful these wonders are and why are they called so. The incredible architecture and construction speaks the volumes of these places around the world.
